Experimental investigation of flame stabilization using conical bluff body for thrust augmenters

The main objective is to obtain the blow-off limit of a stabilized flame within a constant area duct with a conical bluff body which enhances the flame stabilization. Along with the blow off limit, the methods of improvising the stoichiometric air-fuel ratio to control the flame instabilities occurring in thrust augmenters can also be antagonized. The setup comprises of a diffuser, settling chamber, plenum chamber, fuel injection system and the test section. Initially the conical bluff body is placed in the test section area constructed with mild steel, when the flame fires within this area, it is diverged into two sections due to the presence of the conical bluff body which forms a recirculation zone immediately near the bluff body and diminishes far downstream. The dynamics of the conical bluff body and the mass fuel rate play a major role in controlling the flame instabilities. Viewing the images of these flame structures using Image-J software gives a detailed analysis of the colour radical representation and the layers of complete and incomplete combustion occurring during the flame stabilization and blow off event.The main objective is to obtain the blow-off limit of a stabilized flame within a constant area duct with a conical bluff body which enhances the flame stabilization. Along with the blow off limit, the methods of improvising the stoichiometric air-fuel ratio to control the flame instabilities occurring in thrust augmenters can also be antagonized. The setup comprises of a diffuser, settling chamber, plenum chamber, fuel injection system and the test section. Initially the conical bluff body is placed in the test section area constructed with mild steel, when the flame fires within this area, it is diverged into two sections due to the presence of the conical bluff body which forms a recirculation zone immediately near the bluff body and diminishes far downstream. The dynamics of the conical bluff body and the mass fuel rate play a major role in controlling the flame instabilities. Viewing the images of these flame structures using Image-J software gives a detailed analysis of the colour radical representa...